<template>
  <div class="index-list-wrapper">
    <scroll
      class="index-list"
      ref="scrollRef"
      :probe-type="3"
      @scroll="onScroll"
    >
      <ul ref="groupRef">
        <li v-for="group in data" :key="group.title" class="group">
          <h2 class="title">{{ group.title }}</h2>
          <ul>
            <li
              v-for="item in group.list"
              :key="item.id"
              class="item"
              @click="onItemClick(item)"
            >
              <img class="avatar" v-lazy="item.pic" alt="" />
              <span class="name">{{ item.name }}</span>
            </li>
          </ul>
        </li>
      </ul>
      <div class="fixed" v-show="fixedTitle" :style="fixedStyle">
        <div class="fixed-title">{{ fixedTitle }}</div>
      </div>
      <div
        class="shortcut"
        @touchstart.stop.prevent="onShortcutTouchStart"
        @touchmove.stop.prevent="onShortcutTouchMove"
        @touchend.stop.prevent
      >
        <ul>
          <li
            v-for="(item, index) in shortcutList"
            :key="index"
            class="item"
            :data-index="index"
            :class="{ current: currentIndex === index }"
          >
            {{ item }}
          </li>
        </ul>
      </div>
    </scroll>
  </div>
</template>

<script>
import Scroll from '@/components/wrap-scroll/index'
import useFixed from './use-fixed'
import useShortcut from './use-shortcut'
export default {
  props: {
    data: {
      type: Array,
      default() {
        return []
      }
    }
  },
  emits: [],
  components: {
    Scroll
  },
  setup(props, { emit }) {
    const { groupRef, onScroll, fixedTitle, fixedStyle, currentIndex } = useFixed(props)
    const { shortcutList, onShortcutTouchStart, scrollRef, onShortcutTouchMove } = useShortcut(props, groupRef)
    function onItemClick(item) {
      emit('select', item)
    }
    return {
      groupRef,
      onScroll,
      fixedTitle,
      fixedStyle,
      shortcutList,
      currentIndex,
      onShortcutTouchStart,
      scrollRef,
      onShortcutTouchMove,
      onItemClick
    }
  }
}
</script>
<style lang="scss" scoped>
.index-list {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
  .group {
    padding-bottom: 30px;
    .title {
      height: 30px;
      line-height: 30px;
      padding-left: 20px;
      font-size: $font-size-small;
      color: $color-text-l;
      background: $color-highlight-background;
    }
    .item {
      display: flex;
      align-items: center;
      margin: 20px 0 0 20px;
      .avatar {
        width: 50px;
        height: 50px;
        border-radius: 50%;
      }
      .name {
        margin-left: 20px;
        color: $color-text-l;
        font-size: $font-size-medium;
      }
    }
  }
  .fixed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    .fixed-title {
      height: 30px;
      line-height: 30px;
      padding-left: 20px;
      font-size: $font-size-small;
      color: $color-text-l;
      background: $color-highlight-background;
    }
  }
  .shortcut {
    position: absolute;
    right: 4px;
    top: 50%;
    width: 20px;
    transform: translateY(-50%);
    padding: 20px 0;
    border-radius: 10px;
    text-align: center;
    background: $color-background-d;
    font-family: Helvetica;
    .item {
      padding: 3px;
      line-height: 1;
      color: $color-text-l;
      font-size: $font-size-small;
      &.current {
        color: $color-theme;
      }
    }
  }
}
</style>
